Adding a new object to an ArrayList with only one data type

Question

So I understand that you have to make a "new" object when adding an object to an arraylist:

ex: ArrayList<CookieOrder> orders = new ArrayList<CookieOrder>(); orders.add(new CookieOrder("cookie", 5));

but do you have to do this when the arraylist consists of only one data type

ex: ArrayList<int> numbers = new ArrayList<int>(); numbers.add(new int(2)); or numbers.add(2);

You can't use keyword new with primitives, you just declare them and assign a value, you use new with objects. And you cant have an ArrayList of type int. — whatamidoingwithmylife
– whatamidoingwithmylife, Commented Dec 4, 2017 at 0:16

RenegadeEagle · Accepted Answer · 2017-12-04 00:18:34Z

There is no need to initialize a new "integer" object, because the integer already exists. You can add to an integer arraylist by doing just array.add(2);

Also, ArrayLists in java do not allow primitive types such as ints and doubles as storage. You have to use the classes of them, For example

List<Integer> numbers = new ArrayList<Integer>();

For more information, see this post. Why I can't have int in the type of ArrayList?

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